From: Mike Gilbert <floppym@gentoo.org>
Date: Thu, 28 Dec 2017 02:46:52 +0000 (-0500)
Subject: fileio: write_string_stream_ts: return errors from fputs and fputc
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=340b6a239d1d117da7e40c436a4751c9d56efbd7;p=elogind.git

fileio: write_string_stream_ts: return errors from fputs and fputc

Ignoring errors from these functions may mask errors returned by the
kernel.

Fixes: https://github.com/systemd/systemd/issues/7744
---

diff --git a/src/basic/fileio.c b/src/basic/fileio.c
index 5a918c1e7..eb92ac595 100644
--- a/src/basic/fileio.c
+++ b/src/basic/fileio.c
@@ -65,9 +65,12 @@ int write_string_stream_ts(
         assert(f);
         assert(line);
 
-        fputs(line, f);
+        if (fputs(line, f) == EOF)
+                return -errno;
+
         if (!(flags & WRITE_STRING_FILE_AVOID_NEWLINE) && !endswith(line, "\n"))
-                fputc('\n', f);
+                if (fputc('\n', f) == EOF)
+                        return -errno;
 
         if (ts) {
                 struct timespec twice[2] = {*ts, *ts};